How is fission caused in `U-235` ?

………………………….. brings fission in U^(235) .

Why is a large amount of energy released during fission of uranium ( U -235) ?

The average number of neutrons released per fission in the fission of U^235 is

Energy released during the fission of one Uranium-235 nucleus is 200MeV. Energy released by the fission of 500gm of U-235 nuclei will be about